Beefed up the tests for multi-cache handling of the cache middleware and view decorators, and made a couple of tweaks for edge cases as a result.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@15021 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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@ -85,7 +85,7 @@ class UpdateCacheMiddleware(object):
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return response
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patch_response_headers(response, timeout)
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if timeout:
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cache_key = learn_cache_key(request, response, timeout, self.key_prefix)
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cache_key = learn_cache_key(request, response, timeout, self.key_prefix, cache=self.cache)
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self.cache.set(cache_key, response, timeout)
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return response
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@ -120,17 +120,14 @@ class FetchFromCacheMiddleware(object):
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return None # Don't cache requests from authenticated users.
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# try and get the cached GET response
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cache_key = get_cache_key(request, self.key_prefix, 'GET')
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cache_key = get_cache_key(request, self.key_prefix, 'GET', cache=self.cache)
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if cache_key is None:
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request._cache_update_cache = True
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return None # No cache information available, need to rebuild.
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response = self.cache.get(cache_key, None)
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# if it wasn't found and we are looking for a HEAD, try looking just for that
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if response is None and request.method == 'HEAD':
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cache_key = get_cache_key(request, self.key_prefix, 'HEAD')
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cache_key = get_cache_key(request, self.key_prefix, 'HEAD', cache=self.cache)
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response = self.cache.get(cache_key, None)
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if response is None:
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@ -149,28 +146,33 @@ class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware):
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using the decorator-from-middleware utility.
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"""
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def __init__(self, cache_timeout=None, cache_anonymous_only=None, **kwargs):
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self.cache_timeout = cache_timeout
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if cache_timeout is None:
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self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
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# We need to differentiate between "provided, but using default value",
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# and "not provided". If the value is provided using a default, then
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# we fall back to system defaults. If it is not provided at all,
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# we need to use middleware defaults.
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cache_kwargs = {}
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try:
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self.key_prefix = kwargs.get('key_prefix')
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if self.key_prefix is not None:
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cache_kwargs['KEY_PREFIX'] = self.key_prefix
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else:
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self.key_prefix = ''
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except KeyError:
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self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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cache_kwargs['KEY_PREFIX'] = self.key_prefix
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try:
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cache_alias = kwargs.get('cache_alias')
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if cache_alias is None:
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cache_alias = DEFAULT_CACHE_ALIAS
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if cache_timeout is not None:
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cache_kwargs['TIMEOUT'] = cache_timeout
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except KeyError:
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cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
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cache_kwargs = {}
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try:
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key_prefix = kwargs.get('key_prefix')
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if key_prefix is not None:
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cache_kwargs['KEY_PREFIX'] = key_prefix
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except KeyError:
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cache_kwargs['KEY_PREFIX'] = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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if cache_timeout is None:
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cache_kwargs['TIMEOUT'] = settings.CACHE_MIDDLEWARE_SECONDS
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else:
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cache_kwargs['TIMEOUT'] = cache_timeout
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if cache_anonymous_only is None:
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self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
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@ -178,3 +180,4 @@ class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware):
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self.cache_anonymous_only = cache_anonymous_only
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self.cache = get_cache(cache_alias, **cache_kwargs)
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self.cache_timeout = self.cache.default_timeout
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@ -21,7 +21,7 @@ import re
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import time
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from django.conf import settings
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from django.core.cache import cache
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from django.core.cache import get_cache
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from django.utils.encoding import smart_str, iri_to_uri
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from django.utils.http import http_date
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from django.utils.hashcompat import md5_constructor
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@ -162,7 +162,7 @@ def _generate_cache_header_key(key_prefix, request):
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key_prefix, path.hexdigest())
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return _i18n_cache_key_suffix(request, cache_key)
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def get_cache_key(request, key_prefix=None, method='GET'):
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def get_cache_key(request, key_prefix=None, method='GET', cache=None):
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"""
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Returns a cache key based on the request path. It can be used in the
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request phase because it pulls the list of headers to take into account
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@ -175,13 +175,15 @@ def get_cache_key(request, key_prefix=None, method='GET'):
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if key_prefix is None:
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key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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cache_key = _generate_cache_header_key(key_prefix, request)
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if cache is None:
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cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
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headerlist = cache.get(cache_key, None)
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if headerlist is not None:
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return _generate_cache_key(request, method, headerlist, key_prefix)
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else:
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return None
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def learn_cache_key(request, response, cache_timeout=None, key_prefix=None):
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def learn_cache_key(request, response, cache_timeout=None, key_prefix=None, cache=None):
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"""
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Learns what headers to take into account for some request path from the
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response object. It stores those headers in a global path registry so that
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@ -199,6 +201,8 @@ def learn_cache_key(request, response, cache_timeout=None, key_prefix=None):
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if cache_timeout is None:
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cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
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cache_key = _generate_cache_header_key(key_prefix, request)
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if cache is None:
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cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
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if response.has_header('Vary'):
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headerlist = ['HTTP_'+header.upper().replace('-', '_')
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for header in cc_delim_re.split(response['Vary'])]
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@ -14,12 +14,14 @@ from django.core import management
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from django.core.cache import get_cache, DEFAULT_CACHE_ALIAS
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from django.core.cache.backends.base import InvalidCacheBackendError, CacheKeyWarning
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from django.http import HttpResponse, HttpRequest
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from django.middleware.cache import FetchFromCacheMiddleware, UpdateCacheMiddleware
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from django.middleware.cache import FetchFromCacheMiddleware, UpdateCacheMiddleware, CacheMiddleware
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from django.test import RequestFactory
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from django.test.utils import get_warnings_state, restore_warnings_state
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from django.utils import translation
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from django.utils import unittest
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from django.utils.cache import patch_vary_headers, get_cache_key, learn_cache_key
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from django.utils.hashcompat import md5_constructor
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from django.views.decorators.cache import cache_page
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from regressiontests.cache.models import Poll, expensive_calculation
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# functions/classes for complex data type tests
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@ -759,6 +761,15 @@ class LocMemCacheTests(unittest.TestCase, BaseCacheTests):
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self.cache = get_cache('locmem://?max_entries=30&cull_frequency=0')
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self.perform_cull_test(50, 19)
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def test_multiple_caches(self):
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"Check that multiple locmem caches are isolated"
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mirror_cache = get_cache('django.core.cache.backends.locmem.LocMemCache')
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other_cache = get_cache('django.core.cache.backends.locmem.LocMemCache', LOCATION='other')
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self.cache.set('value1', 42)
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self.assertEquals(mirror_cache.get('value1'), 42)
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self.assertEquals(other_cache.get('value1'), None)
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# memcached backend isn't guaranteed to be available.
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# To check the memcached backend, the test settings file will
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# need to contain a cache backend setting that points at
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@ -1117,5 +1128,146 @@ class PrefixedCacheI18nTest(CacheI18nTest):
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else:
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settings.CACHES['default']['KEY_PREFIX'] = self.old_cache_key_prefix
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class CacheMiddlewareTest(unittest.TestCase):
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def setUp(self):
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self.orig_cache_middleware_alias = settings.CACHE_MIDDLEWARE_ALIAS
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self.orig_cache_middleware_key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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self.orig_caches = settings.CACHES
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settings.CACHE_MIDDLEWARE_ALIAS = 'other'
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settings.CACHE_MIDDLEWARE_KEY_PREFIX = 'middlewareprefix'
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settings.CACHES = {
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'default': {
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'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'
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},
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'other': {
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'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
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'LOCATION': 'other',
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'TIMEOUT': '1'
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}
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}
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def tearDown(self):
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settings.CACHE_MIDDLEWARE_ALIAS = self.orig_cache_middleware_alias
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settings.CACHE_MIDDLEWARE_KEY_PREFIX = self.orig_cache_middleware_key_prefix
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settings.CACHES = self.orig_caches
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def test_middleware(self):
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def view(request, value):
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return HttpResponse('Hello World %s' % value)
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factory = RequestFactory()
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middleware = CacheMiddleware()
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prefix_middleware = CacheMiddleware(key_prefix='prefix1')
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timeout_middleware = CacheMiddleware(cache_timeout=1)
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request = factory.get('/view/')
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# Put the request through the request middleware
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result = middleware.process_request(request)
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self.assertEquals(result, None)
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response = view(request, '1')
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# Now put the response through the response middleware
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response = middleware.process_response(request, response)
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# Repeating the request should result in a cache hit
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result = middleware.process_request(request)
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self.assertNotEquals(result, None)
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self.assertEquals(result.content, 'Hello World 1')
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# The same request through a different middleware won't hit
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result = prefix_middleware.process_request(request)
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self.assertEquals(result, None)
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# The same request with a timeout _will_ hit
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result = timeout_middleware.process_request(request)
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self.assertNotEquals(result, None)
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self.assertEquals(result.content, 'Hello World 1')
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def test_view_decorator(self):
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def view(request, value):
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return HttpResponse('Hello World %s' % value)
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# decorate the same view with different cache decorators
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default_view = cache_page(view)
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default_with_prefix_view = cache_page(key_prefix='prefix1')(view)
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explicit_default_view = cache_page(cache='default')(view)
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explicit_default_with_prefix_view = cache_page(cache='default', key_prefix='prefix1')(view)
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other_view = cache_page(cache='other')(view)
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other_with_prefix_view = cache_page(cache='other', key_prefix='prefix2')(view)
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factory = RequestFactory()
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request = factory.get('/view/')
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# Request the view once
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response = default_view(request, '1')
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self.assertEquals(response.content, 'Hello World 1')
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# Request again -- hit the cache
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response = default_view(request, '2')
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self.assertEquals(response.content, 'Hello World 1')
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# Requesting the same view with the explicit cache should yield the same result
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response = explicit_default_view(request, '3')
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self.assertEquals(response.content, 'Hello World 1')
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# Requesting with a prefix will hit a different cache key
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response = explicit_default_with_prefix_view(request, '4')
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self.assertEquals(response.content, 'Hello World 4')
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# Hitting the same view again gives a cache hit
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response = explicit_default_with_prefix_view(request, '5')
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self.assertEquals(response.content, 'Hello World 4')
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# And going back to the implicit cache will hit the same cache
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response = default_with_prefix_view(request, '6')
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self.assertEquals(response.content, 'Hello World 4')
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# Requesting from an alternate cache won't hit cache
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response = other_view(request, '7')
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self.assertEquals(response.content, 'Hello World 7')
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# But a repeated hit will hit cache
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response = other_view(request, '8')
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self.assertEquals(response.content, 'Hello World 7')
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# And prefixing the alternate cache yields yet another cache entry
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response = other_with_prefix_view(request, '9')
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self.assertEquals(response.content, 'Hello World 9')
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# But if we wait a couple of seconds...
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time.sleep(2)
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# ... the default cache will still hit
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cache = get_cache('default')
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response = default_view(request, '10')
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self.assertEquals(response.content, 'Hello World 1')
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# ... the default cache with a prefix will still hit
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response = default_with_prefix_view(request, '11')
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self.assertEquals(response.content, 'Hello World 4')
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# ... the explicit default cache will still hit
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response = explicit_default_view(request, '12')
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self.assertEquals(response.content, 'Hello World 1')
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# ... the explicit default cache with a prefix will still hit
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response = explicit_default_with_prefix_view(request, '13')
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self.assertEquals(response.content, 'Hello World 4')
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# .. but a rapidly expiring cache won't hit
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response = other_view(request, '14')
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self.assertEquals(response.content, 'Hello World 14')
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# .. even if it has a prefix
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response = other_with_prefix_view(request, '15')
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self.assertEquals(response.content, 'Hello World 15')
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if __name__ == '__main__':
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unittest.main()
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